mescc: Mes C Library: Bugfix __ungetc_clear.

* lib/linux/_open3.c (_open3): Remove __ungetc_init ();
* lib/mes/mes_open.c (mes_open): Likewise.
* lib/mes/fdungetc.c (fdungetc): Likewise.
* lib/mes/fdgetc.c (__ungetc_p, __ungetc_clear, __ungetc_set): Call
__ungetc_init if buffer is uninitialized.

lib/linux/_open3.c

@@ -27,7 +27,6 @@ int
 _open3 (char const *file_name, int flags, int mask)
 {
   int r = _sys_call3 (SYS_open, (long) file_name, (int) flags, (int) mask);
-  __ungetc_init ();
   if (r > 2)
     {
       __ungetc_clear (r);

lib/mes/fdgetc.c

@@ -32,6 +32,8 @@ int *__ungetc_buf;
 int
 __ungetc_p (int filedes)
 {
+  if (__ungetc_buf == 0)
+    __ungetc_init ();
   return __ungetc_buf[filedes] >= 0;
 }
 
@@ -50,19 +52,24 @@ __ungetc_init ()
 void
 __ungetc_clear (int filedes)
 {
+  if (__ungetc_buf == 0)
+    __ungetc_init ();
   __ungetc_buf[filedes] = -1;
 }
 
 void
 __ungetc_set (int filedes, int c)
 {
+  if (__ungetc_buf == 0)
+    __ungetc_init ();
   __ungetc_buf[filedes] = c;
 }
 
 int
 fdgetc (int fd)
 {
-  __ungetc_init ();
+  if (__ungetc_buf == 0)
+    __ungetc_init ();
 
   char c;
   int i = __ungetc_buf[fd];

lib/mes/fdungetc.c

@@ -24,7 +24,6 @@
 int
 fdungetc (int c, int fd)
 {
-  __ungetc_init ();
   if (c == -1)
     return c;
   else if (__ungetc_p (fd))

lib/mes/mes_open.c

@@ -32,7 +32,6 @@ int __stderr = STDERR;
 int
 mes_open (char const *file_name, int flags, int mask)
 {
-  __ungetc_init ();
   int filedes = open (file_name, flags, mask);
   if (filedes > 2)
     __ungetc_clear (filedes);